Since entering the hobby a few months ago and restoring my Space Shuttle, I've been intrigued reading and learning about the history and evolution of Williams' various solid state platforms. The naming convention was pretty logical as the systems evolved, from the proto-experimental Systems 1&2, to the well known Systems 3-7, (8 used for non-pins), System 9 and... wait... the very similar System 11 into WMS and P2K...
So what happened to System 10? Even the manuals for Space Shuttle - written at the beginning of the System 9 era - mention the "forthcoming System 11" as a compatible service option. Was there some internal strife (perhaps due to the gaming industry crash) that killed a nascent System 10 - forcing the available 9 to be tweaked and renamed? Was 10 going to be a revolutionary platform (like Pin2K) whose development was abandoned? Or was the leapfrog simply as mundane as avoiding typeface confusion of "System 10" for "System IO (input/output)"?